Snowmobile mode surveys by ClearView Geophysics Inc.
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This document summarizes several geophysical survey methods that can be used on snowmobiles, including cesium magnetics, IMAGEM, Ohm-Mapper, PROMIS, EM34, EM31, and EM61. Cesium magnetics uses a base station and rover sensor mounted on a sled pulled behind a snowmobile. IMAGEM uses transmitter and receiver coils on separate sleds to transmit alternating half sine waves and measure the response. Ohm-Mapper and PROMIS also transmit signals but have different receiver configurations. EM34, EM31, and EM61 are electromagnetic induction instruments with different coil spacings and penetration depths towed behind snowmobiles.
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When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
Immersive Learning That Works: Research Grounding and Paths Forward
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
Farming systems analysis: what have we learnt?.pptx
Presentation given at the official farewell of Prof Ken Gillet at Wageningen on 13 June 2024
The cost of acquiring information by natural selection
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
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Handwritten best quality
Travis Hills of MN is Making Clean Water Accessible to All Through High Flux ...
By harnessing the power of High Flux Vacuum Membrane Distillation, Travis Hills from MN envisions a future where clean and safe drinking water is accessible to all, regardless of geographical location or economic status.
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Isolation of pure culture, its various method.
Gadgets for management of stored product pests_Dr.UPR.pdf
Insectsplayamajorroleinthedeteriorationoffoodgrainscausingbothquantitativeandqualitativelosses
Wellprovedthatnogranariescanbefilledwithgrainswithoutinsectsastheharvestedproducecontainegg(or)larvae(or)pupae(or)adultinsectinthembecauseoffieldcarryoverinfestationwhichcannotbeavoidedindevelopingcountrieslikeIndia
Simpletechnologiesfortimelydetectionofinsectsinthestoredproduceandtherebyplantimelycontrolmeasures
Alternate Wetting and Drying - Climate Smart Agriculture
Alternate Wetting and Drying - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Alternate Wetting and Drying presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024. Methods of grain storage Structures in India.pdf
•Post-harvestlossesaccountforabout10%oftotalfoodgrainsduetounscientificstorage,insects,rodents,micro-organismsetc.,
•Totalfoodgrainproductioninindiais311milliontonnesandstorageis145mt.InIndia,annualstoragelosseshavebeenestimated14mtworthofRs.7,000croreinwhichinsectsaloneaccountfornearlyRs.1,300crores.
•InIndiaoutofthetotalproduction,about30%ismarketablesurplus
•Remaining70%isretainedandstoredbyfarmersforconsumption,seed,feed.Hence,growerneedstoragefacilitytoholdaportionofproducetosellwhenthemarketingpriceisfavourable
•TradersandCo-operativesatmarketcentresneedstoragestructurestoholdgrainswhenthetransportfacilityisinadequate
Direct Seeded Rice - Climate Smart Agriculture
Direct Seeded Rice - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
Evidence of Jet Activity from the Secondary Black Hole in the OJ 287 Binary S...
Wereport the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifrequency observing campaign was set up to search for such a signature of the impact based on a prediction made 8 yr earlier. The first I-band results of the flare have already been reported by Kishore et al. (2024). Here we combine these data with our monitoring in the R-band. There is a big change in the R–I spectral index by 1.0 ±0.1 between the normal background and the flare, suggesting a new component of radiation. The polarization variation during the rise of the flare suggests the same. The limits on the source size place it most reasonably in the jet of the secondary BH. We then ask why we have not seen this phenomenon before. We show that OJ287 was never before observed with sufficient sensitivity on the night when the flare should have happened according to the binary model. We also study the probability that this flare is just an oversized example of intraday variability using the Krakow data set of intense monitoring between 2015 and 2023. We find that the occurrence of a flare of this size and rapidity is unlikely. In machine-readable Tables 1 and 2, we give the full orbit-linked historical light curve of OJ287 as well as the dense monitoring sample of Krakow.
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
The binding of cosmological structures by massless topological defects
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
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The binding of cosmological structures by massless topological defects
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Snowmobile mode surveys by ClearView Geophysics Inc.
- 2. Cesium Magnetics • GEM Systems Base Station (2) • Leapfrogged along grid • Base and rover synced to GPS time • Scintrex NavMag; 1 or 2 sensors • Aluminum sleigh • Rover sensor typically ~1m above surface • Readings at 10x per second • GPS NMEA ported into Navmag console for navigation and positioning • GPS antenna and mag sensor(s) on sleigh • Batteries, console and GPS equipment on snowmobile • Ideally use wide-track snowmobiles (e.g., Bearcat) • Data layback and latency corrected using in-house software <CVNAV.exe> • Also can resample by position
- 4. IMAGEM • Height above ground: 1/2 to 1m • Configuration: Rx and Tx on separate plastic sleighs • Horizontal co-planar geometry • Length: 3.7m • Width: 1.14m Transmitter • Type: Horizontal square equivalent (4.41 m2) • Current: nominally 700 A • # of turns: 1 • Moment: 3100 Am2 Receiver • Type: Horizontal Loop • Radius: Variable • Recording channels: 1-50 (on-time) • 51-200 (off-time) Signal • Waveform Alternating positive and negative half sine wave • On-time ch1 8us to ch50 686us • Off-time ch51 699us to ch200 4.53ms • Windows can be modified in a parameter file • Sounding frequency 30 Hz
- 6. IMAGEM and Cesium Mag
- 7. Ohm-Mapper • Discontinued by Geometrics but still available for rent/sale • 2.5m/5m/10m between Rx’s • Offset Tx for multiple n’s • 1 or 2 seconds per reading
- 8. Example data line with 5 receivers. *.stn is the raw data file viewed in MagMap test.dat is RES2D file exported from MagMap *.bmp is a quick inversion in demo mode... ftp://geom.geometrics.com/pub/mag/Softw are/magmap_latest.exe
- 9. PROMIS • 20m/50m/100m/200m separation cables • ~3 seconds per full sweep 110 Hz through 56 kHz
- 10. Geonics EM34-3 XL • XL version has increased Tx power and larger coil • S/N improved by 10x at 40-m separation • S/N improved by 4x at 10-m and 20-m separation • Can use tilt-meters but for vertical dipoles mode in relatively flat terrain with long sleighs deemed not necessary • Penetration ~0.75x and 1.5x horizontal and vertical dipole separation respectivley
- 11. Geonics EM31 & EM61 • EM31 has penetration of ~6-m vertical dipoles; EM61 ~2-3 m penetration • EM31 Connected to DAP logger that records EM31 I/P & O/P plus GPS positioning at 10x per second • However, each EM31 reading takes ~1 second to acquire which can be corrected • EM61 has single frequency 9.8 kHz • Other options such as GEM-2 with multiple frequencies, shorter configuration • See Geonics paper on why EM31 single freq. (TN-30)